Headphones or Speakers not recognized by your Avita Clarus ?

Check your speaker and headphone connections for loose cables or the wrong jack.

Check your power and volume levels, and try turning all the volume controls up.

Some speakers have their own volume controls, and you might have to check them all.

Try connecting using a different USB port.(And remember that your speakers probably won't work when headphones are plugged in)

If the issue persists move over to the next steps

The headphone device might be disabled and hidden in Playback devices.

Follow these:

Open Start > Setting > Devices

On Bluetooth & Other devices scroll down and open Sound settings

On the Playback tab Right-click the blank place, and then select Show Disconnected Devices and Show Disabled Devices. After that, you’ll see headphones appear in the Playback devices shown in Disabled status.

Right-click the headphones and click Enable. After the device is enabled, if you see it not set as Default Device, highlight it and click the Set Default button (If it’s already set as default device, move on to next step)

Click OK > Apply.

Check to see if the problem is resolved.

NOTE: Before performing any significant repairs, back up your computer's hard drive.

If that doesn't work you can try this

Update sound drivers

Go to Start/window and right-click

From the list of results click Device manager

In Device manager under sound, video and game controllers, select your sound card open it